Her Brooding Duke by Marie Higgins

Two strangers bound by fate—a duke haunted by distrust, and a woman with no memory—must unlock the secrets of her past to heal their hearts.

Louisa wakes from a deep, heavy fog, surrounded by strangers and horrified to discover she’s been the sole victim of a terrible buggy accident. Worse… she remembers nothing. But oddly enough, she trusts her rescuer and feels protected in his presence.
Trevor Worthington, Duke of Kenbridge, can’t trust women. Yet after nearly killing the amnesiac Louisa, he has little choice but to open his home to her. His heart softens to the straggly woman in beggar’s garb as he strives to help her regain her memory.
As proof of Louisa’s scars, both physical and those lurking beneath the surface, come to light, Trevor finds himself more and more drawn to the mysterious woman. However, he is hesitant to enter another nightmarish entanglement like his first marriage.